Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
5-65
/ 105
A reference design of GNSS antenna is shown as below.
Figure 37: Reference Circuit of GNSS Antenna
1. An external LDO can be selected to supply power according to the active antenna requirement.
2. If the module is designed with a passive antenna, then the VDD circuit is not needed.
5.3. Antenna Installation
5.3.1. Antenna Requirement
The following table shows the requirements on main antenna, Rx-diversity antenna and GNSS antenna.
Table 30: Antenna Requirements
Type
Requirements
GNSS
1)
Frequency range: 1561MHz~1615MHz
Polarization: RHCP or linear
VSWR: <2 (Typ.)
Passive antenna gain: > 0dBi
Active antenna noise figure: <1.5dB
Active antenna gain: > 0dBi
Active antenna embedded LNA gain: <17 dB
GSM/WCDMA/LTE
VSWR: ≤2
Efficiency: > 30%
NOTES